An overview of the current status of CMB observations (2009)
In this paper we briefly review the current status of the Cosmic Microwave Background (CMB) observations, summarising the latest results obtained from CMB experiments, both in intensity and...
Curto, A., Martinez-Gonzalez, E., Barreiro, R. B.
We present new constraints on the non-linear coupling parameter fnl with the Wilkinson Microwave Anisotropy Probe (WMAP) data. We use a method based on the spherical Mexican hat wavelet (SMHW) which...
Component separation methods for the PLANCK mission (2008)
Leach, S. M., Baccigalupi, C., Barreiro, R. B., Betoule, M., Bobin, J., ...
Context. The PLANCK satellite will map the full sky at nine frequencies from 30 to 857 GHz. The CMB intensity and polarization that are its prime targets are contaminated by foreground emission....
A linear filter to reconstruct the ISW effect from CMB and LSS observations (2008)
Barreiro, R. B., Vielva, P., Hernandez-Monteagudo, C., Martinez-Gonzalez, E.
The extraction of a signal from some observational data sets that contain different contaminant emissions, often at a greater level than the signal itself, is a common problem in Astrophysics and...
WMAP 5-year constraints on fnl with wavelets (2008)
Curto, A., Martinez-Gonzalez, E., Mukherjee, P., Barreiro, R. B., Hansen, F. K., Liguori, M., ...
We present a Gaussianity analysis of the WMAP 5-year Cosmic Microwave Background (CMB) temperature anisotropy data maps. We use several third order estimators based on the spherical Mexican hat...
Component separation methods for the Planck mission (2008)
Leach, S. M., Baccigalupi, C., Barreiro, R. B., Betoule, M., Bobin, J., ...
The Planck satellite will map the full sky at nine frequencies from 30 to 857 GHz. The CMB intensity and polarization that are its prime targets are contaminated by foreground emission. The goal of...
Constraints on the non-linear coupling parameter fnl with the Archeops data (2008)
Curto, A., Macias-Perez, J. F., Martinez-Gonzalez, E., Barreiro, R. B., Santos, D., Hansen, F. K., ...
We present a Gaussianity analysis of the Archeops Cosmic Microwave Background (CMB) temperature anisotropy data maps at high resolution to constrain the non-linear coupling parameter fnl...
Non-Gaussianity analysis on local morphological measures of WMAP data (2008)
Wiaux, Y., Vielva, P., Barreiro, R. B., Martínez-González, E., Vandergheynst, P.
The decomposition of a signal on the sphere with the steerable wavelet constructed from the second Gaussian derivative gives access to the orientation, signed-intensity and elongation of the...
A linear filter to reconstruct the ISW effect from CMB and LSS observations (2008)
Barreiro, R. B., Vielva, P., Hernandez-Monteagudo, C., Martinez-Gonzalez, E.
Component separation methods for the PLANCK mission (2008)
Leach, Samuel M., Baccigalupi, Carlo, Barreiro, R.B., De Zotti, Gianfranco, Gonzalez-Nuevo, Joaquin, ...
The Planck satellite will map the full sky at nine frequencies from 30 to 857 GHz. The CMB intensity and polarization that are its prime targets are contaminated by foreground emission. The goal of...
WAVELET REGULARISED MAXIMUM ENTROPY (2007)
K. S. Maisinger, M. P. Hobson, R. B. Barreiro
Wavelet functions allow the sparse and efficient representation of a signal at different scales. Recently the application of wavelets to the denoising of maps of Cosmic Microwave Background (CMB)...
Statistical analysis of undetected point sources in cosmic microwave background maps (2007)
Argueso, Francisco, Sanz, J.L., Barreiro, R.B., Herranz, D., Gonzalez-Nuevo, Joaquin
Cosmic microwave background (CMB) temperature anisotropies follow a Gaussian statistical distribution in the standard inflationary model, but there are non-Gaussian contributions due to astrophysical...
Comparison of filters for the detection of point sources in Planck simulations (2007)
Lopez-Caniego, Marcos, Herranz, D., Gonzalez-Nuevo, Joaquin, Sanz, J.L., Barreiro, R.B., Vielva, P., ...
We study the detection of extragalactic point sources in two-dimensional flat simulations for all the frequencies of the forthcoming ESA's Planck mission. In this work we have used the most recent...
Testing gaussianity on Archeops data (2007)
Curto, A., Aumont, J., Macias-Perez, J.F., Martinez-Gonzalez, E., Barreiro, R.B., Santos, D., ...
A Gaussianity analysis using a goodness-of-fit test has been performed to study the measured Archeops Cosmic Microwave Background (CMB) temperature anisotropy data for a 143 GHz Archeops bolometer....
Testing gaussianity on Archeops data (2007)
Curto, A., Aumont, J., Macias-Perez, J.F., Martinez-Gonzalez, E., Barreiro, R.B., Santos, D., ...
A Gaussianity analysis using a goodness-of-fit test has been performed to study the measured Archeops Cosmic Microwave Background (CMB) temperature anisotropy data for a 143 GHz Archeops bolometer....
Testing gaussianity on Archeops data (2007)
Curto, A., Aumont, J., Macias-Perez, J.F., Martinez-Gonzalez, E., Barreiro, R.B., Santos, D., ...
A Gaussianity analysis using a goodness-of-fit test has been performed to study the measured Archeops Cosmic Microwave Background (CMB) temperature anisotropy data for a 143 GHz Archeops bolometer....
A low CMB variance in the WMAP data (2007)
Monteserin, C., Barreiro, R. B., Vielva, P., Martinez-Gonzalez, E., Hobson, M. P., Lasenby, A. N.
We have estimated the CMB variance from the three-year WMAP data, finding a value which is significantly lower than the one expected from Gaussian simulations using the WMAP best-fit cosmological...
Non-Gaussianity analysis on local morphological measures of WMAP data (2007)
Wiaux, Y., Vielva, P., Barreiro, R. B., Martinez-Gonzalez, E., Vandergheynst, P.
The decomposition of a signal on the sphere with the steerable wavelet constructed from the second Gaussian derivative gives access to the orientation, signed-intensity, and elongation of the...
Cosmological applications of a wavelet analysis on the sphere (2007)
McEwen, J. D., Vielva, P., Wiaux, Y., Barreiro, R. B., Cayon, L., Hobson, M. P., ...
The cosmic microwave background (CMB) is a relic radiation of the Big Bang and as such it contains a wealth of cosmological information. Statistical analyses of the CMB, in conjunction with other...
Cosmological applications of a wavelet analysis on the sphere (2007)
McEwen, J. D., Vielva, P., Wiaux, Y., Barreiro, R. B., Cayón, L., Hobson, M. P., ...
The cosmic microwave background (CMB) is a relic radiation of the Big Bang and as such it contains a wealth of cosmological information. Statistical analyses of the CMB, in conjunction with other...
Testing Gaussianity on Archeops Data (2006)
Curto, A., Aumont, J., Macias-Perez, J. F., Martinez-Gonzalez, E., Barreiro, R. B., Santos, D., ...
A Gaussianity analysis using a goodness-of-fit test and the Minkowski functionals on the sphere has been performed to study the measured Archeops Cosmic Microwave Background (CMB) temperature...
Gaussian analysis of the CMB with the smooth tests of goodness of fit (2006)
Barreiro, R. B., Rubino-Martin, J. A., Martinez-Gonzalez, E.
The study of the Gaussianity of the cosmic microwave background (CMB) radiation is a key topic to understand the process of structure formation in the Universe. In this paper, we review a very useful...
Statistical analysis of undetected point sources in cosmic microwave background maps (2006)
Argueso, F., Sanz, J. L., Barreiro, R. B., Herranz, D., Gonzalez-Nuevo, J.
Cosmic microwave background (CMB) temperature anisotropies follow a Gaussian statistical distribution in the standard inflationary model, but there are non-Gaussian contributions due to astrophysical...
Knudsen, K. K., Barnard, V. E., Van Der Werf, P. P., Vielva, P., Blain, A. W., ...
Extracting sources with low signal-to-noise from maps with structured background is a non-trivial task which has become important in studying the faint end of the submillimetre number counts. In this...
Comparison of filters for the detection of point sources in Planck simulations (2006)
Lopez-Caniego, M., Herranz, D., Gonzalez-Nuevo, J., Sanz, J. L., Barreiro, R. B., Vielva, P., ...
We study the detection of extragalactic point sources in two-dimensional flat simulations for all the frequencies of the forthcoming ESA's Planck mission. In this work we have used the most recent...
Rubiño-Martín, J.A., Aliaga, A.M., Barreiro, R.B., Battye, R.A., Carreira, P., Cleary, K., ...
Out of the 41 published VSA individual pointings dedicated to cosmological [cosmic microwave background (CMB)] observations, 37 are found to be consistent with Gaussianity, whereas four pointings...
Effect of component separation on the temperature distribution of the CMB (2006)
Barreiro, R.B., Martinez-Gonzalez, E., Vielva, P., Hobson, M.P.
We present a study of the effect of component separation on the recovered cosmic microwave background (CMB) temperature distribution. First, we extract the CMB component from simulated multifrequency...
Scalar quantities as detectors of non-Gaussianity on CMB maps (2006)
Monteserin, C., Barreiro, R. B., Martinez-Gonzalez, E., Sanz, J. L.
We study the power of several scalar quantities constructed on the sphere (presented in Monteserin et al. 2005) to detect non-Gaussianity on the temperature distribution of the cosmic microwave...
Non-Gaussianity in the Very Small Array CMB maps with Smooth-Goodness-of-fit tests (2006)
Rubino-Martin, Jose Alberto, Aliaga, Antonio M., Barreiro, R. B., Battye, Richard A., Carreira, Pedro, Cleary, Kieran, ...
(Abridged) We have used the Rayner & Best (1989) smooth tests of goodness-of-fit to study the Gaussianity of the Very Small Array (VSA) data. Out of the 41 published VSA individual pointings...
Knudsen, K. K., Barnard, V. E., Van Der Werf, P. P., Vielva, P., Blain, A. W., ...
Extracting sources with low signal-to-noise from maps with structured background is a non-trivial task which has become important in studying the faint end of the submillimetre number counts. In this...
Knudsen, K. K., Barnard, V. E., Van Der Werf, P. P., Vielva, P., Blain, A. W., ...
Extracting sources with low signal-to-noise from maps with structured background is a non-trivial task which has become important in studying the faint end of the submillimetre number counts. In this...
Knudsen, K. K., Barnard, V. E., Van Der Werf, P. P., Vielva, P., Blain, A. W., ...
Extracting sources with low signal-to-noise from maps with structured background is a non-trivial task which has become important in studying the faint end of the submillimetre number counts. In this...
Knudsen, K. K., Barnard, V. E., Van Der Werf, P. P., Vielva, P., Kneib, J. P., Blain, A. W., ...
Extracting sources with low signal-to-noise ratio (S/N) from maps with structured background is a non-trivial task which has become important in studying the faint end of the submillimetre (submm)...
Techniques for compact source extraction on CMB maps (2005)
The detection of compact sources embedded in a background is a very common problem in many fields of Astronomy. In these lecture notes we present a review of different techniques developed for the...
Scalar statistics on the sphere: application to the CMB (2005)
Monteserin, C., Barreiro, R. B., Sanz, J. L., Martinez-Gonzalez, E.
A method to compute several scalar quantities of Cosmic Microwave Background maps on the sphere is presented. We consider here four type of scalars: the Hessian matrix scalars, the distortion...
Lopez-Caniego, M., Herranz, D., Barreiro, R. B., Sanz, J. L.
In this note we stress the necessity of a careful check of the arguments used by Vio & Andreani (2005) (VA hereinafter) to criticise the superior performance of the biparametric scale adaptive filter...
A Bayesian approach to filter design: detection of compact sources (2005)
Lopez-Caniego, M., Herranz, D., Barreiro, R. B., Sanz, J. L.
We consider filters for the detection and extraction of compact sources on a background. We make a one-dimensional treatment (though a generalization to two or more dimensions is possible) assuming...
Filter design for the detection of compact sources based on the Neyman-Pearson detector (2005)
Lopez-Caniego, M., Herranz, D., Barreiro, R. B., Sanz, J. L.
This paper considers the problem of compact source detection on a Gaussian background in 1D. Two aspects of this problem are considered: the design of the detector and the filtering of the data. Our...
Detection of point sources on two-dimensional images based on peaks (2005)
Lopez-Caniego, M., Herranz, D., Sanz, J. L., Barreiro, R. B.
This article considers the detection of point sources in two dimensional astronomical images. The detection scheme we propose is based on peak statistics. We discuss the example of the detection of...
Effect of component separation on the temperature distribution of the CMB (2005)
Barreiro, R. B., Martinez-Gonzalez, E., Vielva, P., Hobson, M. P.
We present a study of the effect of component separation on the recovered cosmic microwave background (CMB) temperature distribution, considering Gaussian and non-Gaussian input CMB maps. First, we...
Effect of component separation on the temperature distribution of the CMB (2005)
Barreiro, R.B., Martinez-Gonzalez, E., Vielva, P., Hobson, M.P.
We present a study of the effect of component separation on the recovered cosmic microwave background (CMB) temperature distribution. First, we extract the CMB component from simulated multifrequency...
Effect of component separation on the temperature distribution of the CMB (2005)
Barreiro, R.B., Martinez-Gonzalez, E., Vielva, P., Hobson, M.P.
We present a study of the effect of component separation on the recovered cosmic microwave background (CMB) temperature distribution. First, we extract the CMB component from simulated multifrequency...
Detection of Point Sources on Two-Dimensional Images Based on Peaks (2005)
M. López-Caniego, D. Herranz, J. L. Sanz, R. B. Barreiro
This paper considers the detection of point sources in two-dimensional astronomical images. The detection scheme we propose is based on peak statistics. We discuss the example of the detection of far...
Detection of Point Sources on Two-Dimensional Images Based on Peaks (2005)
M. López-Caniego, D. Herranz, J. L. Sanz, R. B. Barreiro
This paper considers the detection of point sources in two-dimensional astronomical images. The detection scheme we propose is based on peak statistics. We discuss the example of the detection of far...
Gaussianity of the CMB: Smooth Goodness of Fit Tests Applied to Interferometric Data (2004)
Aliaga, A. M., Rubino-Martin, J. A., Martinez-Gonzalez, E., Barreiro, R. B., Sanz, J. L.
We adapt the smooth tests of goodness of fit developed by Rayner and Best to the study of the non-Gaussianity of interferometric observations of the cosmic microwave background (CMB). The...
The estimation of the SZ effects with unbiased multifilters (2004)
Herranz, D., Sanz, J. L., Barreiro, R. B., Lopez-Caniego, M.
In this work we study the performance of linear multifilters for the estimation of the amplitudes of the thermal and kinematic Sunyaev-Zel'dovich effects. We show that when both effects are present,...
Stolyarov, V., Hobson, M. P., Lasenby, A. N., Barreiro, R. B.
We present an extension of the harmonic-space maximum-entropy component separation method (MEM) for multi-frequency CMB observations that allows one to perform the separation with more plausible...
The very bright SCUBA galaxy count: looking for SCUBA galaxies with the Mexican Hat Wavelet (2004)
Barnard, V. E., Vielva, P., Blain, A. W., Barreiro, R. B., Richer, J. S., ...
We present the results of a search for bright high-redshift galaxies in two large SCUBA scan-maps of Galactic regions. A Mexican Hat Wavelet technique was used to locate point sources in these maps,...
Aliaga, A. M., Martinez-Gonzalez, E., Cayon, L., Argueso, F., Sanz, J. L., Barreiro, R. B., ...
We review two powerful methods to test the Gaussianity of the cosmic microwave background (CMB): one based on the distribution of spherical wavelet coefficients and the other on smooth tests of...
Detection of non-Gaussianity in the WMAP 1-year data using spherical wavelets (2003)
Vielva, P., Martinez-Gonzalez, E., Barreiro, R. B., Sanz, J. L., Cayon, L.
A non-Gaussian detection in the WMAP 1-year data is reported. The detection has been found in the combined Q-V-W map proposed by the WMAP team (Komatsu et al. 2003) after applying a wavelet technique...
Goodness-of-fit tests of Gaussianity: constraints on the cumulants of the MAXIMA data (2003)
Aliaga, A. M., Martinez-Gonzalez, E., Cayon, L., Argueso, F., Sanz, J. L., Barreiro, R. B.
In this work, goodness-of-fit tests are adapted and applied to CMB maps to detect possible non-Gaussianity. We use Shapiro-Francia test and two Smooth goodness-of-fit tests: one developed by Rayner...
Comparing filters for the detection of point sources (2003)
Barreiro, R. B., Sanz, J. L., Herranz, D., Martinez-Gonzalez, E.
This paper considers filters (the Mexican hat wavelet, the matched and the scale-adaptive filters) that optimize the detection/separation of point sources on a background. We make a one-dimensional...
Foreground separation using a flexible maximum-entropy algorithm: an application to COBE data (2003)
Barreiro, R. B., Hobson, M. P., Banday, A. J., Lasenby, A. N., Stolyarov, V., Vielva, P., ...
A flexible maximum-entropy component separation algorithm is presented that accommodates anisotropic noise, incomplete sky-coverage and uncertainties in the spectral parameters of foregrounds. The...
Scale-Adaptive filters for the detection/separation of compact sources (2002)
Herranz, D., Sanz, J. L., Barreiro, R. B., Martinez-Gonzalez, E.
This paper presents scale-adaptive filters that optimize the detection/separation of compact sources on a background. We assume that the sources have a multiquadric profile, i. e. $\tau (x) = {[1 +...
Herranz, D., Sanz, J. L., Hobson, M. P., Barreiro, R. B., Diego, J. M., Martinez-Gonzalez, E., ...
The problem of detecting Sunyaev-Zel'dovich (SZ) clusters in multifrequency CMB observations is investigated using a number of filtering techniques. A multifilter approach is introduced, which...
Combining maximum-entropy and the mexican hat wavelet to reconstruct the microwave sky (2001)
Vielva, P., Barreiro, R. B., Hobson, M. P., Martinez-Gonzalez, E., Lasenby, A. N., Sanz, J. L., ...
We present a maximum-entropy method (MEM) and `Mexican Hat' wavelet (MHW) joint analysis to recover the different components of the microwave sky from simulated observations by the ESA Planck...
The discriminating power of wavelets to detect non-Gaussianity in the CMB (2001)
Barreiro, R. B., Hobson, M. P.
We investigate the power of wavelet techniques in detecting non-Gaussianity in the cosmic microwave background (CMB). We use the method to discriminate between an inflationary and a cosmic strings...
Regularization and Inverse Problems (2001)
Lasenby, A. N., Barreiro, R. B., Hobson, M. P.
An overview is given of Bayesian inversion and regularization procedures. In particular, the conceptual basis of the maximum entropy method (MEM) is discussed, and extensions to positive/negative and...
Combined MEM and MHW analysis of CMB observations (2000)
Barreiro, R. B., Vielva, P., Hobson, M. P., Martinez-Gonzalez, E., Lasenby, A. N., Sanz, J. L., ...
We present a combined maximum-entropy method (MEM) and Mexican Hat wavelet (MHW) analysis in order to recover the different components of the microwave sky. We apply this technique to simulated...
Geometrical estimators as a test of Gaussianity in the CMB (2000)
Barreiro, R. B., Martinez-Gonzalez, E., Sanz, J. L.
We investigate the power of geometrical estimators on detecting non-Gaussianity in the cosmic microwave background. In particular the number, eccentricity and Gaussian curvature of excursion sets...
Looking for non-Gaussianity in the COBE-DMR data with spherical wavelets (2000)
Barreiro, R. B., Hobson, M. P., Lasenby, A. N., Banday, A. J., Gorski, K. M., Hinshaw, G.
We present an analysis of the Gaussianity of the 4-year COBE-DMR data (in HEALPix pixelisation) based on spherical wavelets. The skewness, kurtosis and scale-scale correlation spectra are computed...
Testing the Gaussianity of the COBE-DMR data with spherical wavelets (2000)
Barreiro, R. B., Hobson, M. P., Lasenby, A. N., Banday, A. J., Gorski, K. M., Hinshaw, G.
We investigate the Gaussianity of the 4-year COBE-DMR data (in HEALPix pixelisation) using an analysis based on spherical Haar wavelets. We use all the pixels lying outside the Galactic cut and...
Isotropic Wavelets: a Powerful Tool to Extract Point Sources from CMB Maps (1999)
Cayon, L., Sanz, J. L., Barreiro, R. B., Matinez-Gonzalez, E., Vielva, P., Toffolatti, L., ...
It is the aim of this paper to introduce the use of isotropic wavelets to detect and determine the flux of point sources appearing in CMB maps. The most suited wavelet to detect point sources...
Analysis of CMB maps with 2D wavelets (1999)
Sanz, J. L., Barreiro, R. B., Cayon, L., Martinez-Gonzalez, E., Ruiz, G. A., Diaz, F. J., ...
We consider the 2D wavelet transform with two scales to study sky maps of temperature anisotropies in the cosmic microwave background radiation (CMB). We apply this technique to simulated maps of...
The Cosmic Microwave Background: State of the Art (1999)
We review the current status of the cosmic microwave background (CMB) radiation, including a brief discussion of some basic theoretical aspects as well as a summary of anisotropy detections and CMB...
Wavelets Applied to CMB Maps: a Multiresolution Analysis for Denoising (1999)
Sanz, J. L., Argueso, F., Cayon, L., Martinez-Gonzalez, E., Barreiro, R. B., Toffolatti, L.
Analysis and denoising of Cosmic Microwave Background (CMB) maps are performed using wavelet multiresolution techniques. The method is tested on $12^{\circ}.8\times 12^{\circ}.8$ maps with resolution...
The effect of point sources on satellite observations of the cosmic microwave background (1998)
Hobson, M. P., Barreiro, R. B., Toffolatti, L., Lasenby, A. N., Sanz, J. L., Jones, A. W., ...
We study the effect of extragalactic point sources on satellite observations of the cosmic microwave background (CMB). In order to separate the contributions due to different foreground components, a...
Correlation of Excursion Sets for Non-Gaussian CMB Temperature Distributions (1997)
Barreiro, R. B., Sanz, J. L., Martinez-Gonzalez, E., Silk, J.
We present a method, based on the correlation function of excursion sets above a given threshold, to test the Gaussianity of the CMB temperature fluctuations in the sky. In particular, this method...
Peaks in the Cosmic Microwave Background: flat versus open models (1996)
Barreiro, R. B., Sanz, J. L., Martinez-Gonzalez, E., Cayon, L., Silk, Joseph
We present properties of the peaks (maxima) of the CMB anisotropies expected in flat and open CDM models. We obtain analytical expressions of several topological descriptors: mean number of maxima...